18448340198399 has 4 divisors (see below), whose sum is σ = 18448729854000. Its totient is φ = 18447950542800.

The previous prime is 18448340198363. The next prime is 18448340198413. The reversal of 18448340198399 is 99389104384481.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18448340198399 - 2²⁴ = 18448323421183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18448340798399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194756774 + ... + 194851475.

It is an arithmetic number, because the mean of its divisors is an integer number (4612182463500).

Almost surely, 2^{18448340198399} is an apocalyptic number.

18448340198399 is a deficient number, since it is larger than the sum of its proper divisors (389655601).

18448340198399 is an equidigital number, since it uses as much as digits as its factorization.

18448340198399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389655600.

The product of its (nonzero) digits is 214990848, while the sum is 71.

The spelling of 18448340198399 in words is "eighteen trillion, four hundred forty-eight billion, three hundred forty million, one hundred ninety-eight thousand, three hundred ninety-nine".